BBC oil pressure sender - Chevelle Tech
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post #1 of 14 (permalink) Old Jun 14th, 20, 12:48 AM Thread Starter
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BBC oil pressure sender

I'd appreciate some input. The 427 I built recently is nearing ready to fire, but one thing that is hanging me up is the oil pressure sender, which I have multiple problems with.

First is I insist on having both a light and a gauge. When I had a small block in it last, I built this to accommodate both:



It was fine in the small block, I could plumb it into the back of the block. With a big block, not so much. I think I want to find a way to mount it on the back of the driver's side cylinder head. I could use a different Tee or manifold with a mounting bracket, but I can't seem to find anything that will work.

The other issue I'm fighting is where it exits the block. Mine is a 4 bolt that has the large fitting there, and it's pointed rearward at the ground, right at the clutch linkage. This is the first 4 bolt block I've had, so I don't know if this is normal. I suspect the fitting has been there since the block was cast in 71. It would be fine with an automatic trans, but not going to work with mechanical clutch linkage. There isn't room to get a 90 degree fitting on it with the way it's made. I'm thinking of trying to remove the large fitting there are replacing it with one that comes straight out, as it does on 2 bolt blocks, but somehow I doubt it's going to want to budge.

Suggestions welcomed,

Devin

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post #2 of 14 (permalink) Old Jun 14th, 20, 1:32 AM
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Wink Re: BBC oil pressure sender

Use one (or two) of the holes in the oil galley just above the oil pan on the left side. Plug the factory hole.
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post #3 of 14 (permalink) Old Jun 14th, 20, 8:32 AM
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Re: BBC oil pressure sender

I would suggest using steel pipe nipples. I have had brass nipples crack and leak due to vibration.

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post #4 of 14 (permalink) Old Jun 14th, 20, 12:04 PM Thread Starter
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Re: BBC oil pressure sender

It's difficult to get a good pic of it, but this is the problem.



This is the 2 large plugs on the oil pan rail above the oil filter. The outlet port is pointed right at the clutch linkage. There's no room to get a 90 degree fitting in there. When I ran a 2 bolt block previously, it had the smaller fitting and came out straight.

Devin

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post #5 of 14 (permalink) Old Jun 14th, 20, 1:06 PM
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Re: BBC oil pressure sender

If you don't mind the extra length line there is also a plug in the very front of the drivers side that you can use.

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post #6 of 14 (permalink) Old Jun 14th, 20, 5:33 PM Thread Starter
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Re: BBC oil pressure sender

TC saves me again. I think I’ll use the one on the front

Thanks

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post #7 of 14 (permalink) Old Jun 15th, 20, 9:49 PM
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Re: BBC oil pressure sender

You can also use a 45 deg out of the block, to a short length of braided line, to the sender(s). Mount the senders where ever it’s convenient.
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post #8 of 14 (permalink) Old Jun 16th, 20, 7:58 AM
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Re: BBC oil pressure sender

Quote:
Originally Posted by SSJohn View Post
You can also use a 45 deg out of the block, to a short length of braided line, to the sender(s). Mount the senders where ever it’s convenient.
This^^^. That's the way the OEM did it with this BBC 45° fitting!
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post #9 of 14 (permalink) Old Jun 16th, 20, 8:24 AM
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Re: BBC oil pressure sender

My 67 looks like a 69 with that fitting and an electric guage.

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post #10 of 14 (permalink) Old Jun 16th, 20, 10:43 AM
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Re: BBC oil pressure sender

I too wanted the factory idiot light along with my mechanical pressure gauge, but I didn't want all that plumbing hanging off the block near the clutch z-bar.

I ran just the small copper line from the block thru the firewall to under the dash. (uses least plumbing on the block) Under the dash is where I installed a tee on the line and installed the oil light sending unit on the tee and then a copper line from the tee to the mechanical gauge. Problem solved.

The only downside was I had to run the blue oil sending light wire from outside of the firewall back thru the firewall so I could attach it to the oil sending unit now relocated to behind the dash. NBD.

I grew a 3d printed bracket to hold the tee to a dash support arm behind the dash, but you could just cable tie the tee down to a support as well.
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post #11 of 14 (permalink) Old Jun 16th, 20, 11:03 PM Thread Starter
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Re: BBC oil pressure sender

Quote:
Originally Posted by David Bates View Post
This^^^. That's the way the OEM did it with this BBC 45° fitting!
This fitting in the block is what is giving me trouble from the start. It's pointed right at the clutch linkage, and I don't think I can even get a copper line on it without interference issues.

Devin

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post #12 of 14 (permalink) Old Jun 16th, 20, 11:07 PM Thread Starter
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Re: BBC oil pressure sender

Quote:
Originally Posted by RAIDER SS View Post
I too wanted the factory idiot light along with my mechanical pressure gauge, but I didn't want all that plumbing hanging off the block near the clutch z-bar.

I ran just the small copper line from the block thru the firewall to under the dash. (uses least plumbing on the block) Under the dash is where I installed a tee on the line and installed the oil light sending unit on the tee and then a copper line from the tee to the mechanical gauge. Problem solved.

The only downside was I had to run the blue oil sending light wire from outside of the firewall back thru the firewall so I could attach it to the oil sending unit now relocated to behind the dash. NBD.

I grew a 3d printed bracket to hold the tee to a dash support arm behind the dash, but you could just cable tie the tee down to a support as well.
The copper line and wiring is not a big deal, it's getting away from the linkage that's the problem.

I had originally planned to use that fitting and run it to my Tee mounted to the back of the cylinder head, but I don't think I can get a copper line out of the way and my fabrication skills are lacking to make it mount to anything.

Devin

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post #13 of 14 (permalink) Old Jun 17th, 20, 7:35 AM
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Re: BBC oil pressure sender

Quote:
Originally Posted by 64SS427 View Post
This fitting in the block is what is giving me trouble from the start. It's pointed right at the clutch linkage, and I don't think I can even get a copper line on it without interference issues.

Devin
I believe that fitting should be oriented pointing up fwiw. Yours appears to be pointing down which would definitely make things difficult if not impossible as you are experiencing. Your fitting also appears to be seated very deeply into the block which is problematic.

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post #14 of 14 (permalink) Old Jun 19th, 20, 3:16 PM
 
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As others have offered, I ran an oil line from the block fitting up the back of the block and over to the fender well under the power brake. There I mounted both the electric gauge sender and warning light sender. I used a "T" fitting much like yours to connect both senders to the oil line. This arrangement is not all that noticeable and allows for sufficient clearance for any linkage in the area of the block fitting. My brass block fitting does however face up, so that may create a clearance problem if yours does not.
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